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Question

Difficulty: MediumPhysiological Adaptation

An emergency department nurse is continuously monitoring a client who sustained severe blunt abdominal trauma. The client's baseline vital signs upon arrival were blood pressure 124/76 mm Hg, heart rate 82/min, and respiratory rate 16/min. Which of the following subsequent assessment findings should the nurse identify as the earliest clinical indicator of hemorrhagic shock?

  1. Blood pressure of 118/88 mm Hg and a heart rate of 98/minAnswer
  2. B
    Blood pressure of 86/52 mm Hg and a heart rate of 124/min
  3. C
    Arterial blood gas results demonstrating uncompensated metabolic acidosis
  4. D
    Presence of cold, mottled extremities with barely palpable pedal pulses

Answer

Blood pressure of 118/88 mm Hg and a heart rate of 98/min
In the early (compensatory) stage of hemorrhagic shock, the sympathetic nervous system is activated in response to decreased circulating volume. This triggers the release of catecholamines, causing peripheral vasoconstriction and an increased heart rate. The vasoconstriction disproportionately elevates the diastolic blood pressure, leading to a narrowed pulse pressure (the difference between systolic and diastolic pressure). Identifying this subtle trend (e.g., pulse pressure narrowing from 48 to 30 mm Hg) allows the nurse to intervene before the client decompensates.

Step-by-Step Solution

1
Analyze the baseline vital signs provided in the scenario.
Baseline: BP 124/76 (Pulse Pressure = 48 mm Hg), HR 82/min. The client has abdominal trauma, placing them at high risk for internal hemorrhage.
Establishing a baseline is essential to identify subtle trending changes that indicate physiological decompensation.
2
Recall the pathophysiology of the early (compensatory) stage of shock.
The body activates the sympathetic nervous system, releasing epinephrine and norepinephrine. This causes vasoconstriction and an increased heart rate to maintain perfusion to vital organs.
Understanding compensatory mechanisms helps differentiate early signs from late signs of shock.
3
Evaluate the clinical manifestations of sympathetic activation on vital signs.
Vasoconstriction primarily increases diastolic blood pressure, while systolic remains relatively stable, resulting in a narrowed pulse pressure. Mild tachycardia also occurs concurrently.
A narrowing pulse pressure and increasing heart rate are the most reliable early indicators of volume loss before frank hypotension occurs.
4
Compare the options against the timeline of shock progression.
Hypotension, metabolic acidosis, and mottled skin are all signs of progressive or irreversible shock where compensation has already failed.
The question specifically asks for the earliest clinical indicator, making the narrowed pulse pressure the correct choice.

Key Concept

Early recognition of compensatory shock through narrowed pulse pressure and tachycardia
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Topics

Physiological Adaptation

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